Differentiate external from internal links

[SidVal]

Differentiate _black from _self

The idea is differentiate between two (or more) links one into the same page, and other external.

Example; here: https://docsify.js.org/#/quickstart?id=writing-content

We had an INTERNAL link:

(...) of course you can add more pages.

And a EXTERNAL link (pointing a new tab):

(...) head over to the docsify-cli documentation.

Both links look the same on the website.
There are no visual differences.

What is the best way to differentiate both links?

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Maybe with a external class ? But, how will put the class into .md files? 🤔

[SidVal]

I fixed this situation with CSS.
The source of the code: https://stackoverflow.com/a/18168287/4822186

Just great 👏 !